<template>
  <jy-dialog :title="title" :visible.sync="open" width="800px" append-to-body>
    <div class="upload-file">
      <el-upload v-if="!disabled" multiple :action="uploadFileUrl" :before-upload="handleBeforeUpload"
        :file-list="fileList" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
        :on-success="handleUploadSuccess" :show-file-list="false" :headers="headers" class="upload-file-uploader"
        ref="fileUpload">
        <!-- 上传按钮 -->
        <el-button size="mini" type="primary">选取文件</el-button>
        <!-- 上传提示 -->
        <div class="el-upload__tip" slot="tip" v-if="showTip">
          请上传
          <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
          <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
          的文件
        </div>
      </el-upload>

      <!-- 文件列表 -->
      <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
        <li :key="file.url" class="el-upload-list__item ele-upload-list__item-content"
          v-for="(file, index) in fileList">
          <!-- <el-link :href="`${file.url}`" :underline="false" target="_blank">
          <span class="el-icon-document el-link-text"> {{ getFileName(file.name) }} </span>
        </el-link> -->
          <div class="el-link-text" @click="download(file)" :title="getFileName(file.name)">
            <span class="el-icon-document"> </span>
            {{ getFileName(file.name) }}
          </div>
          <div class="ele-upload-list__item-content-action">
            <el-button size="mini" type="text" icon="el-icon-view" @click="previewFile(file)">预览</el-button>
            <el-button v-if="!disabled" size="mini" type="text" class="red cd-mr8" icon="el-icon-delete"
              @click="handleDelete(index)">删除</el-button>
          </div>
        </li>
      </transition-group>
    </div>
    <div slot="footer" class="dialog-footer">
      <el-button size="small" @click="cancel">关 闭</el-button>
    </div>
  </jy-dialog>
</template>

<script>
import { getToken } from "@/utils/auth";
import { listByIds, delOss } from "@/api/system/oss";

export default {
  name: "FileUpload",
  props: {
    // 数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 100,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg', "doc", "docx", "xlsx", "xls", "pdf"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    // 是否禁用
    disabled: {
      type: Boolean,
      default: false
    },
  },
  data () {
    return {
      title: '附件上传',
      open: false,
      number: 0,
      uploadList: [],
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/system/oss/upload", // 上传文件服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },
  // watch: {
  //   value: {
  //     async handler (val) {
  //       if (val) {
  //         let temp = 1;
  //         // 首先将值转为数组
  //         let list;
  //         if (Array.isArray(val)) {
  //           list = val;
  //         } else {
  //           await listByIds(val).then(res => {
  //             list = res.data.map(oss => {
  //               oss = { name: oss.originalName, url: oss.url, ossId: oss.ossId, fileSuffix: oss.fileSuffix };
  //               return oss;
  //             });
  //           });
  //         }
  //         // 然后将数组转为对象数组
  //         this.fileList = list.map(item => {
  //           item = { name: item.name, url: item.url, ossId: item.ossId, fileSuffix: item.fileSuffix };
  //           item.uid = item.uid || new Date().getTime() + temp++;
  //           return item;
  //         });
  //       } else {
  //         this.fileList = [];
  //         return [];
  //       }
  //     },
  //     deep: true,
  //     immediate: true
  //   }
  // },
  computed: {
    // 是否显示提示
    showTip () {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    init (index, fileId, fileIdOld) {
      this.index = index;
      this.fileId = fileId;
      this.fileIdOld = fileIdOld;
      this.ossList = [];
      this.getList();
      this.open = true;
    },
    async getList () {
      if (this.fileId) {
        const val = this.fileId;
        let temp = 1;
        // 首先将值转为数组
        let list;
        if (Array.isArray(val)) {
          list = val;
        } else {
          await listByIds(val).then(res => {
            list = res.data.map(oss => {
              oss = { name: oss.originalName, url: oss.url, ossId: oss.ossId, fileSuffix: oss.fileSuffix };
              return oss;
            });
          });
        }
        // 然后将数组转为对象数组
        this.fileList = list.map(item => {
          item = { name: item.name, url: item.url, ossId: item.ossId, fileSuffix: item.fileSuffix };
          item.uid = item.uid || new Date().getTime() + temp++;
          return item;
        });
      } else {
        this.fileList = [];
        return [];
      }
    },
    // 上传前校检格式和大小
    handleBeforeUpload (file) {
      // 校检文件类型
      if (this.fileType) {
        const fileName = file.name.split('.');
        const fileExt = fileName[fileName.length - 1];
        const isTypeOk = this.fileType.indexOf(fileExt) >= 0;
        if (!isTypeOk) {
          this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`);
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传文件，请稍候...");
      this.number++;
      return true;
    },
    // 文件个数超出
    handleExceed () {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError (err) {
      this.$modal.msgError("上传文件失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传成功回调
    handleUploadSuccess (res, file) {
      if (res.code === 200) {
        this.uploadList.push({ name: res.data.fileName, url: res.data.url, ossId: res.data.ossId, fileSuffix: res.data.fileSuffix });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.fileUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除文件
    handleDelete (index) {
      let ossId = this.fileList[index].ossId;
      if (this.oldList.length == 0 || (this.oldList.length > 0 && !this.oldList.includes(ossId))) {
        delOss(ossId);
      }
      this.fileList.splice(index, 1);
      // this.$emit("input", this.listToString(this.fileList));
      this.$emit("callBack", this.index, this.listToString(this.fileList));
    },
    // 上传结束处理
    uploadedSuccessfully () {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("callBack", this.index, this.listToString(this.fileList));
        this.$modal.closeLoading();
      }
    },
    // 获取文件名称
    getFileName (name) {
      // 如果是url那么取最后的名字 如果不是直接返回
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1);
      } else {
        return name;
      }
    },
    // 对象转成指定字符串分隔
    listToString (list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].ossId + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
    // 文件地址转换
    fileUrlTransition (url) {
      if (process.env.VUE_APP_FILE_PATH != undefined) {
        // 截取路径前半部分
        const path = process.env.VUE_APP_OSS_PATH;
        if (url.lastIndexOf(path) > -1) {
          return location.origin + process.env.VUE_APP_FILE_PATH + url.slice(url.lastIndexOf(path) + path.length);
        }
      }
      return url;
    },
    // 下载
    async download (row) {
      this.$download.oss(row.ossId);
    },
    cancel () {
      this.ossList = [];
      this.open = false;
    },
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}

.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

.el-link-text {
  width: calc(100% - 120px);
  overflow: hidden;
  /* 隐藏超出的内容 */
  white-space: nowrap;
  /* 不换行 */
  text-overflow: ellipsis;
  /* 使用省略号表示超出部分 */
}

.ele-upload-list__item-content-action {
  width: 100px;
  display: flex;
  align-items: center;
}

.red {
  color: #f56c6c
}
</style>
